Vol. 21, No. 1, pp. 54-63 (2025)
BENDING CAPACITY OF COLD-FORMED THIN-WALLED
STEEL TUBES INFILLED WITH GYPSUM
Bo Su 1, *, Yi-Wen Liu 1 and Jiao Zhang 2
1 Department of Civil Engineering, Jiangsu University, Zhenjiang, 212000, China
2 School of Building Engineering, Changzhou Vocational Institute of Engineering, Changzhou, 213161, China
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 4 March 2024; Revised: 6 September 2024; Accepted: 7 September 2024
DOI:10.18057/IJASC.2025.21.1.5
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ABSTRACT
Cold-formed thin-walled steel tubes (CTSP) find common use in light steel structures and solar panel brackets, yet they are prone to collapse due to local instability and bending failure. To enhance the bending capacity of CTSP, this paper introduces a new composite structure known as gypsum-reinforced cold-formed thin-walled steel tubes (GCTSP), aiming to preserve high stiffness, stability, and lightweight characteristics. The study proceeds in two main phases: Three types of GCTSP (Section sizes of 80mm×40mm, 80m×60mm, 80mm×80mm) undergo four-point bending experiments to determine components’ ultimate bending capacity. Finite element (FE) models are established to investigate the influence of different aspect ratios (1.00, 1.14, 1.33, 1.60, 2.00) on the bending capacity of GCTSP. Gypsum has been shown to significantly improve the bending capacity of CTSP. This study emphasizes considerable impact of changes in aspect ratio on GCTSP, leading to an increase in bearing capacity between 22% and 90%. Additionally, a proposed calculation formula, accounting for both gypsum reinforcement and aspect ratio effects, demonstrates excellent alignment with experimental data, yielding an error rate below 4%. This study provides valuable insights for enhancing the flexural bearing capacity of GCTSP through gypsum reinforcement, considering different aspect ratios.
KEYWORDS
CTSP, Gypsum, Four-point bending, Composite structure, Finite Element
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